Hi Phil, the validation does not currently check for a specific format since the formatting may vary from country to country as Event Espresso is used by members in different countries.
You can connect in some additional validation via jQuery. Here is a tutorial on Stack Overflow:
The support post ‘How to Force A Format on A Telephone Number Field Entry’ is closed to new replies.
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Support forum for Event Espresso 3 and Event Espresso 4.